The Eastern Bluebird (Sialia sialis) is the most widespread of the three bluebirds (Eastern, Western, Mountain). Although it is mostly “eastern”, its total range extends south to Nicaragua. Most Bluebirds in North America nest in birdhouses put up especially for them. They eat mostly insects and berries. The nest is a loosely constructed cup of weeds, twigs, and dry grass, lined with finer grass, sometimes with animal hair or feathers. The eggs are a pale blue, usually 4-5. Young leave the nest at about 18-19 days.